intelligence committee said american companies should avoid doing any business with china's two leading technology fir firms. here's house select chairman mike roberts on "60 minutes" last evening. take a listen. >> if i was the american company and as the chairman of the house permanent select committee on intelligence and you were looking at wawai i would find another vendor. if you care about intellectual property and you care about the national security of the united states of america. >> should this be a national security concern? let's bring in our guest now, retired four-star general and nbc military analyst, barry mccaffrey. thank you, sir. first of all, wawai, should we stay away from them? no matter what they say, do you regard them as a security risk? they've been operating in the states. you know that. are they still a security risk? >> look, first of all, there are huge telecommunications countries, the second biggest until the world. gt is the fourth biggest in the world. and they're also without a question a cyber threat to america. the u.s. cyber command said last year probably the